This is work done withn the research group at Alias|Wavefront (now part of Autodesk). It was done in 1999 by Jos Stam, one of the stars of computer graphics. It illustrates real time computational fluid dynamics in both 2D and 3D. The 3D simulation is controlled by a 3D camera that captures the user's free-hand gestures in space, and enables the gestrues to "stir up" the particles of virtual smoke in a virtual volume.
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